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Rotational velocities of blue straggler stars in the globular cluster M 55
Monaco, L.; Mucciarelli, A.; Ferraro, F. R. +3 more
By using high-resolution spectra acquired with FLAMES-GIRAFFE at the ESO/VLT, we measured the radial and rotational velocities of 115 stars in the Galactic globular cluster M 55. After field decontamination based on the radial velocity values, the final sample of member stars is composed of 32 blue straggler stars (BSSs) and 76 reference stars pop…
Asteroid material classification based on multi-parameter constraints using artificial intelligence
Li, Juan; Jiang, Xiaojun; Zhang, Xiaoming +7 more
Context. Material types of asteroids provide key clues to their evolutionary history and contained resources. The Gaia mission has released extensive low-resolution spectral observation data of small Solar System bodies. However, methods for classifying asteroids based on low-resolution space-based spectra are still inadequate, and do not fully le…
A multi-wavelength overview of the giant spiral UGC 2885
Holwerda, Benne; Barmby, Pauline; Gorski, Mark +4 more
Context. UGC 2885 (z = 0.01935) is one of the largest and most massive galaxies in the local Universe, yet it has an undisturbed spiral structure, which is unexpected for such an object and is not predicted by cosmological simulations. Understanding the detailed properties of extreme systems such as UGC 2885 can provide insight into the limits of …
SHARP Shock Database
Russell, C. T.; Graham, D. B.; Vink, J. +8 more
Despite more than half a century of Collisionless shock (CS) research, our understanding of the processes of the shock energy dissipation into the charge particle heating and acceleration remains incomplete. To help to address the problem of the rate of the data analysis on CSs being well below of the rate of the data acquisition, an open-source h…
Identifying and Characterizing Infrared Excesses in the Spitzer Kepler Survey (SpiKeS)
Gorjian, Varoujan; Bryden, Geoffrey; Werner, Michael W. +2 more
We report our search for infrared excesses in the Spitzer/Infrared Array Camera survey of the Kepler field at 3.6 and 4.5 µm. The Spitzer Kepler Survey contains ∼190,000 targets, which we reduce to ∼117,000 targets after applying multiple filters to arrive at a high-quality sample for spectral energy distribution fitting. Of the ∼117,000, we…
TOI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue
Trifonov, Trifon; Henning, Thomas; Ramsay, Gavin +63 more
Discovering transiting exoplanets with relatively long orbital periods (>10 d) is crucial to facilitate the study of cool exoplanet atmospheres (Teq < 700 K) and to understand exoplanet formation and inward migration further out than typical transiting exoplanets. In order to discover these longer period transiting exoplanets, lon…
K2-370 b: a strongly irradiated sub-Neptune transiting a very active solar-type star
Vanderburg, A.; Sozzetti, A.; Wilson, T. G. +24 more
We report on the detailed characterization of K2-370 b, a transiting sub-Neptune on a 2.14-d orbit around the chromospherically active G-type dwarf HD 284521 (
The evolutionary state of the red giant star L2 Puppis
Uttenthaler, S.
Context. L2 Puppis (L2 Pup) is a nearby red giant star and an important object in late-type star research because it has a dust disc and potentially a companion. Aims. L2 Pup is often called the second-closest asymptotic giant branch (AGB) star to the sun, second only to R Doradus. However, whether the star is inde…
A global map of gullied hillslopes on Mars
Conway, S. J.; Noblet, A.; Osinski, G. R.
The distribution of gullies on Mars has been used to support different modes of formation involving CO2, H2O or entirely dry processes. We mapped the extent of gullied hillslope using a global mosaic of ConTeXt camera (CTX) at 6 m/pixel and High Resolution Imaging Science Experiment (HiRISE) browse products at ∼3 m/pixel. Our…
Fe/O Variations Relative to Source Longitude and Heliospheric Current Sheet in Large Solar Energetic Particle Events
Moon, Yong-Jae; Jeong, Hyun-Jin; Park, Jinhye +1 more
The Fe/O enhancements exhibit significant variations in gradual solar energetic particle (SEP) events. Several causes have been suggested including transport effects in the interplanetary space and flare contribution. In this study, we investigate the relationship between the integrated Fe/O ratios of 27 gradual SEP events, locations of associated…